Governor for marine engines.



'PATENTED JUNEI-14 "1964.

N. MATTHESEN. EovEENoR Eon MARINE ENGINES.

E No. 762,736.

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UNITED STATES Patented June 1.4, 1904i. 'I

v JOHANNES MATTHIESEN, OF DARMSTADT, GERMANY.

GOVERNOR FOR vMARINE ENGINES.

SPECIFICATION foi-ming part of Letters Patent No. 762,736, dated June 14, 1904.

Application 'lled February 25, 1904. Serial No. 195,200. (No model.)

To all whom it may concern.-

Be it known that I, JOHANNES MATTHIESEN, engineer, a subject of the Emperor of Ger- `many, residing at 56 Wendelstadtstrasse,

Darmstadt, in the Empire of Germany, have invented certain vnew and useful Improvements in Governors for Marine Engines, of which the following is a speciiication.

This invention has reference to marine engines, and has for its object a device for preventing racing when the propeller leaves the water or upon the breaking of the shaft or the like.

The invention consists in the closing of the throttle-valve as soon as the engines, from one or otherof the causes mentioned above, exceed a predetermined maximum velocity. The throttle-valve is reopened as soon as the engines have resumed their normal speed. The displacement of the throttle-valve is ei'- fected by means of a rod connected with the ships engines.

The invention is illustrated, by way of example, in the accompanying drawings, in which- Figure l shows the position in which the throttle-valve is completely open. Fig. 2 is a diagrammatic representation of the position in which the throttle-valve is closed. Fig. 3

shows the locking member upon a larger scale.

The piston d of a pump a, driven Vby the ships engines, isprovided with a hollow piston-rod d', within which a second piston-rod e is displaceably mounted. This rod e ati its lower part, situated outside the hollow pistonrod CZ', carries a cross-head by the intermediary of which it is connected with any reciprocating part of the ships engines. A block y is arranged on the piston-rod e within the hollow piston-rod d and serves as a bearing for aspring f, situated at the lower endv of the hollow piston-rod d', its second point of support being' constituted by the cap e, closing the hollowpiston-rod d' at its lower part.. The rod e passes through this cap. The strength ofthe spring f is calculated in such a manner that up to the attainment of a certain maximum speed of the ships engines the piston (l is caused by therod e to participate in the movement of the engines.

When this maximum speed is exceeded, the piston d remains-behind relatively to the piston-rod e, owing to the compression of the spring f. This relative displacement of the piston-rod e as ,compared with the piston CZ is utilized for closing the throttle-valve. The rod m is rotatably attached at to the hollow piston-rod d, fixed to the piston d, this rod m being itselflrotatably mounted at Z. Upon. the rod m ismounted 'a linlr e', the other extremity of which'is rotatably attached to a bolt n of-a rod t, 'which engages with the piston-rod e at the point g. From the other extremity o of the rod la a rod p, which is articulated thereto, proceeds to an arm j, which by the intermediary of the pawl q serves to rotate the throttle-valve. Upon the shaft s of the throttle-valve is arranged a ratchet-wheel 7, which is provided with teethupon portions of its periphery only. A pawl q, attached to the rod p, engages with the ratchet-wheel. ratchet-wheel a is submitted to the action of a tension-spring w. v Inthe teeth upon the other side and in this position in the outermost tooth engages a second pawl o, which is submitted to the actiony of fa spring in such a mannerthat when Ireleased it is always caused The to engage with the teeth by the action of this 1 spring and prevents rotation of the wheel r with the throttle-valve by the spring w in case this is placed in tension by the rotation of the wheel 1", and the engagement of the pawl o with the latter is not interrupted by the releasing of the pawl o by means of the lrod t. In the open position of the throttlevalve the ratchet-wheel is set by the spring w in such a manner that the pawl c may be disengaged without any displacement of the wheel r and the throttle-valve resulting. The pawl o, which is constituted byy a two-armed lever, engages, by means of a bolt u, provided upon its other extremity, in aslot t of a rod t, which is fixed upon the rod 7L between the points n and 0. I

The operation of the device 'is as follows: When the ships engines are running normally-that is to say, so long kas a predetermined maximum speed is not exceeded-the piston d is displaced by the rod e, owing to the action of thespring f, and the pump sup- IOO plies a certain quantity of water. The rods z and m oscillate around the points o and Z, remaining constantly parallel one with the other in such a manner that the rod p is not displaced vertically-that is to say, it does not act upon the throttle-valve in any way. The rod t, however, constantly moves up and down, and owing to the fact that the slot t' is made of suitable length strikes against the bolt and the pawl e so that this is disengaged at each stroke, which produces no result because the wheel fr remains stationary in the open position of the throttle-valve. As soon, however, as the speed of the engines exceeds the prescribed limit from any cause the pumppiston CZ experiences greater resistance. As the water in the pump and in the pipes of the pump cannot be supplied with the new velocity, it therefore remains with the piston-rod d somewhat behind relatively to the piston-rod c, with compression of the spring f. Owing to this the end of the rod m does not descend to the same extent as the rod L, so that this latter now rotates around the iixed point fa. l ith the point 0, which consequently rises at each stroke of the pump, the rod p is also lifted in such a manner that by means of the pawl q it rotates the ratchet wheel fr and closes the throttle-valve. The ratchet-wheel fr then rotates under the pawl e until this latter, upon the cessation of the rotation, again engages and retains the ratchet-wheel in the corresponding position. If the pawl q has not already come behind the last tooth of the wheel r upon the first and lower downstroke of the rod, upon the succeeding strokes it will come behind the following teeth until linally it only slides up and down upon the smooth part of the wheel 7, where it exerts no infiuenee upon the throttle-valve, as shown in Fig. 2. The throttle-valve is then completely closed.

So long as the engines are running at an excessive speed the position of the throttle-val ve is not altered, because while the end of the slot t has previously during the normal running of the engines lifted the pawl e upon each descent of the rod t by striking on the bolt u this no longer takes place, owing to the diverging position of the rods t and m. So long as the excessive speed of the engines continues the pawl e is not lifted, and therefore prevents a reopening of the throttlevalve until normal 'running is again established, and then by the striking of the rod t on the bolt u and lifting of the pawl e the wheel is released, so that by means of the spring w, which is in tension, it may be rotated, together with the throttle-valve, into the initial or open position.

What I claim, and desire to secure by Letters Patent of the United States, is-

1. A device for closing the throttle-valve of marine engines for preventing the same from racing upon the propeller leaving the water or the like, the said device comprising a pump arranged to be operated by the ships engines and having a piston and piston-rod, a spring connecting the piston with the piston-rod to cause them to make the same stroke during the normal running of the engine the said spring being adapted to be compressed owing to increased resistance to the piston, when a predetermined velocity is exceeded, thereby causing a difference in the stroke of the piston and piston-rod, and means connected with the piston and piston-rod and actuated to close the throttle-valve of the engine when the predetermined velocity is exceeded, the said means including a rod and pawls, and a ratchetwheel on the shaft of the throttle-valve and engaged by said pawls.

2. A device for closing the throttle-valve ol marine engines, comprising a pump having a piston provided with a hollow piston-rod, a second piston-rod arranged within the hollow piston-rod and projecting above the top of the same, the lower part of said rod extending outside the hollow piston-rod and arranged for connection with the ships engines, a spring located in the lower end of thehollow pistonrod and surrounding the said second pistonrod, the said spring having a bearing at one end o n the hollow piston-rod and at the other end on the said second piston-rod, the spring being of sufiicient strength to cause the two piston-rods to move together during the normal runningofl the engine butadapted to yield when a predetermined velocityis exceeded to cause a diiference in the strokes of the piston-rods, and mechanism connected with the piston-rods and the throttle-valve of the engine and actuated to close the throttle-valve when the predetermined velocity is exceeded.

3. The combination with the throttle-valve of an engine, of a pump having' a piston and a hollow piston-rod, a second piston-rod arranged within the hollow piston-rod and driven from the engine, a spring yieldingly connecting the piston-rods, whereby they may move together during the normal running of the engine and may move relative to each other when a predetermined velocity is exceeded, a rod pivotally connected at one end with the hollow piston-rod and mounted to oscillate at its other end, a second rod pivotally connected at one end with the second piston-rod, the said rods extending approximately at right angles to the piston-rods, a link connecting the rods between their ends, a rod pivotally connected with the other end of said second rod, and provided with a pawl, a spring-controlled ratchet-wheel on the shaft of the throttle-valve and provided with teeth on opposite portions of its periphery only, one set of said teeth being engaged by said pawl, a spring-pressed pawl engaging the other setof teeth on the ratchet-wheel, and a rod connected with the said second rod for actuating the pawl.

4. The combination with the throttle-valve lOO IO piston and piston-rod and with the said throttle-valve and actuated to close the throttle; valve, as set forth.l

In testimony whereof I have hereunto set my hand, in presence of two subscribing Witnesses, this 2d day of February, 1904.

JOHANNES MATTHIESEN.

Witnesses:

WILHELM JACKEL, SVEN PERSHNG. 

